This is inaccurate due to White's surprising reply. Black can keep only a small disadvantage, normal in opening play, with many moves.
13. e1e3 A good move, since the rook is useful on the third rank. There are options of equal value, the position of a \"slow\" character, meaning that many plans are possible. 13... h7g5  14. f3g5  14... d8g5  15. g2g3 Restricting Black's knight.